Display Sensor Layout for Fingerprint Sensing With Low Parasitic Capacitance
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Solution Overview
Problem
Existing display apparatuses lack integrated bio-information sensing capabilities, particularly for fingerprint recognition, which affects their functionality and efficiency.
Innovation Solution
Incorporating a sensor with a sensing circuit and electrode into a display apparatus, where the sensing electrode forms a variable capacitor with a finger, and arranging pixel circuits symmetrically to minimize parasitic capacitance and enhance fingerprint sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensor is integrated into the display apparatus for fingerprint recognition, then bio-information sensing capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the display function and fingerprint sensing function into a single integrated structure. The sensing electrode is formed in the same layer as the first electrode of the light-emitting device, and the sensing circuit is arranged around the pixel circuits within the display panel structure. This merging approach enables bio-information sensing capability while avoiding the complexity of adding a separate sensor module.
Solution Approach 2:
The display apparatus is designed to perform multiple functions: displaying images through the light-emitting devices and sensing fingerprint information through the sensing electrode and sensing circuit. The same substrate and layer structure support both display pixels and sensing pixels, making the device universal and multi-functional without requiring separate components.
2Area of stationary object
If the sensing circuit is arranged around the pixel circuits, then sensing area is improved, but parasitic capacitance increases
Solution Approach 1:
The patent employs asymmetric arrangement of pixel circuits around the sensing circuit. Specifically, pixel circuits are positioned at specific locations relative to the sensing electrode, with strategic spacing and distribution. This asymmetric configuration allows the sensing area to extend around the pixel circuits while minimizing the overlap and interaction that would generate parasitic capacitance between adjacent circuits.
3Manufacturing precision
If pixel circuits are arranged symmetrically, then manufacturing precision is improved, but parasitic capacitance is minimized
Solution Approach 1:
The patent employs asymmetric arrangement of pixel circuits around the sensing circuit. Specifically, pixel circuits are positioned at specific locations relative to the sensing electrode, with strategic spacing and distribution. This asymmetric configuration allows the sensing area to extend around the pixel circuits while minimizing the overlap and interaction that would generate parasitic capacitance between adjacent circuits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The integration of a sensor with symmetrically arranged pixel circuits improves fingerprint recognition efficiency by reducing parasitic capacitance and enhancing the sensing area, thereby improving overall display performance.
Implementation Method 1
the sensing pixel forms a variable capacitor with respect to a finger
Data Source
AI summary
A display apparatus including a sensor includes: a pixel group including a predetermined number of pixels, each of which includes a pixel circuit and a light-emitting device electrically connected to the pixel circuit; and a sensing pixel including a sensing circuit and a sensing electrode connected to the sensing circuit, where the sensing electrode forms a variable capacitor with respect to a finger, and the sensing circuit is arranged around the pixel circuit of the pixel group.